The men have been traumatized by their experiences. Cpl Richardson-said: "At night time you think about all the people you killed. It just never gets off your head, none of this stuff does. There's no chance to forget it, we're still here, we've been here so long. Most people leave after combat but we haven't."

Sgt Meadows said men under his command had been seeking help for severe depression: "They've already seen psychiatrists and the chain of command has got letters back saying 'these men need to be taken out of this situation'. But nothing's happened." Cpl Richardson added: "Some soldiers don't even f****** sleep at night. They sit up all f****** night long doing s*** to keep themselves busy - to keep their minds off this f****** stuff. It's the only way they can handle it. It's not so far from being crazy but it's their way of coping. There's one guy trying to build a little pool out the back, pointless stuff but it keeps him busy."

Sgt Meadows said: "For me, it's like snap-shot photos. Like pictures of maggots on tongues, babies with their heads on the ground, men with their heads halfway off and their eyes wide open and mouths wide open. I see it every day, every single day. The smells and the torsos burning, the entire route up to Baghdad, from 20 March to 7 April, nothing but burned bodies."

Specialist Bryan Barnhart, 21, joined in: "I also got the images like snapshots in my head. There are bodies that we saw when we went back to secure a place we'd taken. The bodies were still there and they'd been baking in the sun. Their bodies were bloated three times the size."

Sgt Quinones explained: "There are psychiatrists who are trying to sort out their problems but they say it's because of long combat environment. They know we need to be taken away from that environment." But the group's tour of duty has been extended and the men have been forced to remain as peacekeepers. Cpl Richardson said: "Now we're in this peacekeeping, we're always firing off a warning shot at people that don't wanna listen to you. You make up the rules as you go along.

"Like, in Fallujah we get rocks thrown at us by kids. You wanna turn round and shoot one of the little f*****s but you know you can't do that. Their parents know if they came out and threw rocks we'd shoot them. So that's why they send the kids out." Sgt Meadows said: "Can you imagine being a soldier and being told 'you're fighting a war, then when you finish you can go home'.